Re: How much distortion is acceptable on residential utility power?



Dennis Berkowitz wrote:

Operator error?...

I tried two different probes, and both channels on the scope. I also
monitored the waveform from a 9VAC wallwart and its the same shape. So
its not my scope thats clipping due to high voltage.

It's called 'flat topping' amongst EMC people and is indeeed usually due
to the use of 'conventional' rectifier - capacitor input power supplies
which draw current only around the peak voltage of the waveform.

As 'power factor correction' - more correctly harmonics compliance ( see
IEC 61000-3-2 ) becomes more and more common, the effect will reduce. It
is already mandatory for many classes of equipment in the EU for example.

Graham


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